| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'package:collection/collection.dart'; |
| import 'package:test/test.dart'; |
| |
| void main() { |
| var iterable1 = new Iterable.generate(3); |
| var iterable2 = new Iterable.generate(3, (i) => i + 3); |
| var iterable3 = new Iterable.generate(3, (i) => i + 6); |
| |
| test('should combine multiple iterables when iterating', () { |
| var combined = new CombinedIterableView([iterable1, iterable2, iterable3]); |
| expect(combined, [0, 1, 2, 3, 4, 5, 6, 7, 8]); |
| }); |
| |
| test('should combine multiple iterables with some empty ones', () { |
| var combined = |
| new CombinedIterableView([iterable1, [], iterable2, [], iterable3, []]); |
| expect(combined, [0, 1, 2, 3, 4, 5, 6, 7, 8]); |
| }); |
| |
| test('should function as an empty iterable when no iterables are passed', () { |
| var empty = new CombinedIterableView([]); |
| expect(empty, isEmpty); |
| }); |
| |
| test('should function as an empty iterable with all empty iterables', () { |
| var empty = new CombinedIterableView([[], [], []]); |
| expect(empty, isEmpty); |
| }); |
| |
| test('should reflect changes from the underlying iterables', () { |
| var list1 = []; |
| var list2 = []; |
| var combined = new CombinedIterableView([list1, list2]); |
| expect(combined, isEmpty); |
| list1.addAll([1, 2]); |
| list2.addAll([3, 4]); |
| expect(combined, [1, 2, 3, 4]); |
| expect(combined.last, 4); |
| expect(combined.first, 1); |
| }); |
| |
| test('should reflect changes from the iterable of iterables', () { |
| var iterables = <Iterable>[]; |
| var combined = new CombinedIterableView(iterables); |
| expect(combined, isEmpty); |
| expect(combined, hasLength(0)); |
| |
| iterables.add(iterable1); |
| expect(combined, isNotEmpty); |
| expect(combined, hasLength(3)); |
| |
| iterables.clear(); |
| expect(combined, isEmpty); |
| expect(combined, hasLength(0)); |
| }); |
| } |